Index: third_party/libjpeg_turbo/simd/jcclrmmx.asm |
=================================================================== |
--- third_party/libjpeg_turbo/simd/jcclrmmx.asm (revision 0) |
+++ third_party/libjpeg_turbo/simd/jcclrmmx.asm (revision 0) |
@@ -0,0 +1,479 @@ |
+; |
+; jcclrmmx.asm - colorspace conversion (MMX) |
+; |
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
+; |
+; Based on |
+; x86 SIMD extension for IJG JPEG library |
+; Copyright (C) 1999-2006, MIYASAKA Masaru. |
+; For conditions of distribution and use, see copyright notice in jsimdext.inc |
+; |
+; This file should be assembled with NASM (Netwide Assembler), |
+; can *not* be assembled with Microsoft's MASM or any compatible |
+; assembler (including Borland's Turbo Assembler). |
+; NASM is available from http://nasm.sourceforge.net/ or |
+; http://sourceforge.net/project/showfiles.php?group_id=6208 |
+; |
+; [TAB8] |
+ |
+%include "jcolsamp.inc" |
+ |
+; -------------------------------------------------------------------------- |
+ SECTION SEG_TEXT |
+ BITS 32 |
+; |
+; Convert some rows of samples to the output colorspace. |
+; |
+; GLOBAL(void) |
+; jsimd_rgb_ycc_convert_mmx (JDIMENSION img_width, |
+; JSAMPARRAY input_buf, JSAMPIMAGE output_buf, |
+; JDIMENSION output_row, int num_rows); |
+; |
+ |
+%define img_width(b) (b)+8 ; JDIMENSION img_width |
+%define input_buf(b) (b)+12 ; JSAMPARRAY input_buf |
+%define output_buf(b) (b)+16 ; JSAMPIMAGE output_buf |
+%define output_row(b) (b)+20 ; JDIMENSION output_row |
+%define num_rows(b) (b)+24 ; int num_rows |
+ |
+%define original_ebp ebp+0 |
+%define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM] |
+%define WK_NUM 8 |
+%define gotptr wk(0)-SIZEOF_POINTER ; void * gotptr |
+ |
+ align 16 |
+ global EXTN(jsimd_rgb_ycc_convert_mmx) |
+ |
+EXTN(jsimd_rgb_ycc_convert_mmx): |
+ push ebp |
+ mov eax,esp ; eax = original ebp |
+ sub esp, byte 4 |
+ and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits |
+ mov [esp],eax |
+ mov ebp,esp ; ebp = aligned ebp |
+ lea esp, [wk(0)] |
+ pushpic eax ; make a room for GOT address |
+ push ebx |
+; push ecx ; need not be preserved |
+; push edx ; need not be preserved |
+ push esi |
+ push edi |
+ |
+ get_GOT ebx ; get GOT address |
+ movpic POINTER [gotptr], ebx ; save GOT address |
+ |
+ mov ecx, JDIMENSION [img_width(eax)] ; num_cols |
+ test ecx,ecx |
+ jz near .return |
+ |
+ push ecx |
+ |
+ mov esi, JSAMPIMAGE [output_buf(eax)] |
+ mov ecx, JDIMENSION [output_row(eax)] |
+ mov edi, JSAMPARRAY [esi+0*SIZEOF_JSAMPARRAY] |
+ mov ebx, JSAMPARRAY [esi+1*SIZEOF_JSAMPARRAY] |
+ mov edx, JSAMPARRAY [esi+2*SIZEOF_JSAMPARRAY] |
+ lea edi, [edi+ecx*SIZEOF_JSAMPROW] |
+ lea ebx, [ebx+ecx*SIZEOF_JSAMPROW] |
+ lea edx, [edx+ecx*SIZEOF_JSAMPROW] |
+ |
+ pop ecx |
+ |
+ mov esi, JSAMPARRAY [input_buf(eax)] |
+ mov eax, INT [num_rows(eax)] |
+ test eax,eax |
+ jle near .return |
+ alignx 16,7 |
+.rowloop: |
+ pushpic eax |
+ push edx |
+ push ebx |
+ push edi |
+ push esi |
+ push ecx ; col |
+ |
+ mov esi, JSAMPROW [esi] ; inptr |
+ mov edi, JSAMPROW [edi] ; outptr0 |
+ mov ebx, JSAMPROW [ebx] ; outptr1 |
+ mov edx, JSAMPROW [edx] ; outptr2 |
+ movpic eax, POINTER [gotptr] ; load GOT address (eax) |
+ |
+ cmp ecx, byte SIZEOF_MMWORD |
+ jae short .columnloop |
+ alignx 16,7 |
+ |
+%if RGB_PIXELSIZE == 3 ; --------------- |
+ |
+.column_ld1: |
+ push eax |
+ push edx |
+ lea ecx,[ecx+ecx*2] ; imul ecx,RGB_PIXELSIZE |
+ test cl, SIZEOF_BYTE |
+ jz short .column_ld2 |
+ sub ecx, byte SIZEOF_BYTE |
+ xor eax,eax |
+ mov al, BYTE [esi+ecx] |
+.column_ld2: |
+ test cl, SIZEOF_WORD |
+ jz short .column_ld4 |
+ sub ecx, byte SIZEOF_WORD |
+ xor edx,edx |
+ mov dx, WORD [esi+ecx] |
+ shl eax, WORD_BIT |
+ or eax,edx |
+.column_ld4: |
+ movd mmA,eax |
+ pop edx |
+ pop eax |
+ test cl, SIZEOF_DWORD |
+ jz short .column_ld8 |
+ sub ecx, byte SIZEOF_DWORD |
+ movd mmG, DWORD [esi+ecx] |
+ psllq mmA, DWORD_BIT |
+ por mmA,mmG |
+.column_ld8: |
+ test cl, SIZEOF_MMWORD |
+ jz short .column_ld16 |
+ movq mmG,mmA |
+ movq mmA, MMWORD [esi+0*SIZEOF_MMWORD] |
+ mov ecx, SIZEOF_MMWORD |
+ jmp short .rgb_ycc_cnv |
+.column_ld16: |
+ test cl, 2*SIZEOF_MMWORD |
+ mov ecx, SIZEOF_MMWORD |
+ jz short .rgb_ycc_cnv |
+ movq mmF,mmA |
+ movq mmA, MMWORD [esi+0*SIZEOF_MMWORD] |
+ movq mmG, MMWORD [esi+1*SIZEOF_MMWORD] |
+ jmp short .rgb_ycc_cnv |
+ alignx 16,7 |
+ |
+.columnloop: |
+ movq mmA, MMWORD [esi+0*SIZEOF_MMWORD] |
+ movq mmG, MMWORD [esi+1*SIZEOF_MMWORD] |
+ movq mmF, MMWORD [esi+2*SIZEOF_MMWORD] |
+ |
+.rgb_ycc_cnv: |
+ ; mmA=(00 10 20 01 11 21 02 12) |
+ ; mmG=(22 03 13 23 04 14 24 05) |
+ ; mmF=(15 25 06 16 26 07 17 27) |
+ |
+ movq mmD,mmA |
+ psllq mmA,4*BYTE_BIT ; mmA=(-- -- -- -- 00 10 20 01) |
+ psrlq mmD,4*BYTE_BIT ; mmD=(11 21 02 12 -- -- -- --) |
+ |
+ punpckhbw mmA,mmG ; mmA=(00 04 10 14 20 24 01 05) |
+ psllq mmG,4*BYTE_BIT ; mmG=(-- -- -- -- 22 03 13 23) |
+ |
+ punpcklbw mmD,mmF ; mmD=(11 15 21 25 02 06 12 16) |
+ punpckhbw mmG,mmF ; mmG=(22 26 03 07 13 17 23 27) |
+ |
+ movq mmE,mmA |
+ psllq mmA,4*BYTE_BIT ; mmA=(-- -- -- -- 00 04 10 14) |
+ psrlq mmE,4*BYTE_BIT ; mmE=(20 24 01 05 -- -- -- --) |
+ |
+ punpckhbw mmA,mmD ; mmA=(00 02 04 06 10 12 14 16) |
+ psllq mmD,4*BYTE_BIT ; mmD=(-- -- -- -- 11 15 21 25) |
+ |
+ punpcklbw mmE,mmG ; mmE=(20 22 24 26 01 03 05 07) |
+ punpckhbw mmD,mmG ; mmD=(11 13 15 17 21 23 25 27) |
+ |
+ pxor mmH,mmH |
+ |
+ movq mmC,mmA |
+ punpcklbw mmA,mmH ; mmA=(00 02 04 06) |
+ punpckhbw mmC,mmH ; mmC=(10 12 14 16) |
+ |
+ movq mmB,mmE |
+ punpcklbw mmE,mmH ; mmE=(20 22 24 26) |
+ punpckhbw mmB,mmH ; mmB=(01 03 05 07) |
+ |
+ movq mmF,mmD |
+ punpcklbw mmD,mmH ; mmD=(11 13 15 17) |
+ punpckhbw mmF,mmH ; mmF=(21 23 25 27) |
+ |
+%else ; RGB_PIXELSIZE == 4 ; ----------- |
+ |
+.column_ld1: |
+ test cl, SIZEOF_MMWORD/8 |
+ jz short .column_ld2 |
+ sub ecx, byte SIZEOF_MMWORD/8 |
+ movd mmA, DWORD [esi+ecx*RGB_PIXELSIZE] |
+.column_ld2: |
+ test cl, SIZEOF_MMWORD/4 |
+ jz short .column_ld4 |
+ sub ecx, byte SIZEOF_MMWORD/4 |
+ movq mmF,mmA |
+ movq mmA, MMWORD [esi+ecx*RGB_PIXELSIZE] |
+.column_ld4: |
+ test cl, SIZEOF_MMWORD/2 |
+ mov ecx, SIZEOF_MMWORD |
+ jz short .rgb_ycc_cnv |
+ movq mmD,mmA |
+ movq mmC,mmF |
+ movq mmA, MMWORD [esi+0*SIZEOF_MMWORD] |
+ movq mmF, MMWORD [esi+1*SIZEOF_MMWORD] |
+ jmp short .rgb_ycc_cnv |
+ alignx 16,7 |
+ |
+.columnloop: |
+ movq mmA, MMWORD [esi+0*SIZEOF_MMWORD] |
+ movq mmF, MMWORD [esi+1*SIZEOF_MMWORD] |
+ movq mmD, MMWORD [esi+2*SIZEOF_MMWORD] |
+ movq mmC, MMWORD [esi+3*SIZEOF_MMWORD] |
+ |
+.rgb_ycc_cnv: |
+ ; mmA=(00 10 20 30 01 11 21 31) |
+ ; mmF=(02 12 22 32 03 13 23 33) |
+ ; mmD=(04 14 24 34 05 15 25 35) |
+ ; mmC=(06 16 26 36 07 17 27 37) |
+ |
+ movq mmB,mmA |
+ punpcklbw mmA,mmF ; mmA=(00 02 10 12 20 22 30 32) |
+ punpckhbw mmB,mmF ; mmB=(01 03 11 13 21 23 31 33) |
+ |
+ movq mmG,mmD |
+ punpcklbw mmD,mmC ; mmD=(04 06 14 16 24 26 34 36) |
+ punpckhbw mmG,mmC ; mmG=(05 07 15 17 25 27 35 37) |
+ |
+ movq mmE,mmA |
+ punpcklwd mmA,mmD ; mmA=(00 02 04 06 10 12 14 16) |
+ punpckhwd mmE,mmD ; mmE=(20 22 24 26 30 32 34 36) |
+ |
+ movq mmH,mmB |
+ punpcklwd mmB,mmG ; mmB=(01 03 05 07 11 13 15 17) |
+ punpckhwd mmH,mmG ; mmH=(21 23 25 27 31 33 35 37) |
+ |
+ pxor mmF,mmF |
+ |
+ movq mmC,mmA |
+ punpcklbw mmA,mmF ; mmA=(00 02 04 06) |
+ punpckhbw mmC,mmF ; mmC=(10 12 14 16) |
+ |
+ movq mmD,mmB |
+ punpcklbw mmB,mmF ; mmB=(01 03 05 07) |
+ punpckhbw mmD,mmF ; mmD=(11 13 15 17) |
+ |
+ movq mmG,mmE |
+ punpcklbw mmE,mmF ; mmE=(20 22 24 26) |
+ punpckhbw mmG,mmF ; mmG=(30 32 34 36) |
+ |
+ punpcklbw mmF,mmH |
+ punpckhbw mmH,mmH |
+ psrlw mmF,BYTE_BIT ; mmF=(21 23 25 27) |
+ psrlw mmH,BYTE_BIT ; mmH=(31 33 35 37) |
+ |
+%endif ; RGB_PIXELSIZE ; --------------- |
+ |
+ ; mm0=(R0 R2 R4 R6)=RE, mm2=(G0 G2 G4 G6)=GE, mm4=(B0 B2 B4 B6)=BE |
+ ; mm1=(R1 R3 R5 R7)=RO, mm3=(G1 G3 G5 G7)=GO, mm5=(B1 B3 B5 B7)=BO |
+ |
+ ; (Original) |
+ ; Y = 0.29900 * R + 0.58700 * G + 0.11400 * B |
+ ; Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE |
+ ; Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE |
+ ; |
+ ; (This implementation) |
+ ; Y = 0.29900 * R + 0.33700 * G + 0.11400 * B + 0.25000 * G |
+ ; Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE |
+ ; Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE |
+ |
+ movq MMWORD [wk(0)], mm0 ; wk(0)=RE |
+ movq MMWORD [wk(1)], mm1 ; wk(1)=RO |
+ movq MMWORD [wk(2)], mm4 ; wk(2)=BE |
+ movq MMWORD [wk(3)], mm5 ; wk(3)=BO |
+ |
+ movq mm6,mm1 |
+ punpcklwd mm1,mm3 |
+ punpckhwd mm6,mm3 |
+ movq mm7,mm1 |
+ movq mm4,mm6 |
+ pmaddwd mm1,[GOTOFF(eax,PW_F0299_F0337)] ; mm1=ROL*FIX(0.299)+GOL*FIX(0.337) |
+ pmaddwd mm6,[GOTOFF(eax,PW_F0299_F0337)] ; mm6=ROH*FIX(0.299)+GOH*FIX(0.337) |
+ pmaddwd mm7,[GOTOFF(eax,PW_MF016_MF033)] ; mm7=ROL*-FIX(0.168)+GOL*-FIX(0.331) |
+ pmaddwd mm4,[GOTOFF(eax,PW_MF016_MF033)] ; mm4=ROH*-FIX(0.168)+GOH*-FIX(0.331) |
+ |
+ movq MMWORD [wk(4)], mm1 ; wk(4)=ROL*FIX(0.299)+GOL*FIX(0.337) |
+ movq MMWORD [wk(5)], mm6 ; wk(5)=ROH*FIX(0.299)+GOH*FIX(0.337) |
+ |
+ pxor mm1,mm1 |
+ pxor mm6,mm6 |
+ punpcklwd mm1,mm5 ; mm1=BOL |
+ punpckhwd mm6,mm5 ; mm6=BOH |
+ psrld mm1,1 ; mm1=BOL*FIX(0.500) |
+ psrld mm6,1 ; mm6=BOH*FIX(0.500) |
+ |
+ movq mm5,[GOTOFF(eax,PD_ONEHALFM1_CJ)] ; mm5=[PD_ONEHALFM1_CJ] |
+ |
+ paddd mm7,mm1 |
+ paddd mm4,mm6 |
+ paddd mm7,mm5 |
+ paddd mm4,mm5 |
+ psrld mm7,SCALEBITS ; mm7=CbOL |
+ psrld mm4,SCALEBITS ; mm4=CbOH |
+ packssdw mm7,mm4 ; mm7=CbO |
+ |
+ movq mm1, MMWORD [wk(2)] ; mm1=BE |
+ |
+ movq mm6,mm0 |
+ punpcklwd mm0,mm2 |
+ punpckhwd mm6,mm2 |
+ movq mm5,mm0 |
+ movq mm4,mm6 |
+ pmaddwd mm0,[GOTOFF(eax,PW_F0299_F0337)] ; mm0=REL*FIX(0.299)+GEL*FIX(0.337) |
+ pmaddwd mm6,[GOTOFF(eax,PW_F0299_F0337)] ; mm6=REH*FIX(0.299)+GEH*FIX(0.337) |
+ pmaddwd mm5,[GOTOFF(eax,PW_MF016_MF033)] ; mm5=REL*-FIX(0.168)+GEL*-FIX(0.331) |
+ pmaddwd mm4,[GOTOFF(eax,PW_MF016_MF033)] ; mm4=REH*-FIX(0.168)+GEH*-FIX(0.331) |
+ |
+ movq MMWORD [wk(6)], mm0 ; wk(6)=REL*FIX(0.299)+GEL*FIX(0.337) |
+ movq MMWORD [wk(7)], mm6 ; wk(7)=REH*FIX(0.299)+GEH*FIX(0.337) |
+ |
+ pxor mm0,mm0 |
+ pxor mm6,mm6 |
+ punpcklwd mm0,mm1 ; mm0=BEL |
+ punpckhwd mm6,mm1 ; mm6=BEH |
+ psrld mm0,1 ; mm0=BEL*FIX(0.500) |
+ psrld mm6,1 ; mm6=BEH*FIX(0.500) |
+ |
+ movq mm1,[GOTOFF(eax,PD_ONEHALFM1_CJ)] ; mm1=[PD_ONEHALFM1_CJ] |
+ |
+ paddd mm5,mm0 |
+ paddd mm4,mm6 |
+ paddd mm5,mm1 |
+ paddd mm4,mm1 |
+ psrld mm5,SCALEBITS ; mm5=CbEL |
+ psrld mm4,SCALEBITS ; mm4=CbEH |
+ packssdw mm5,mm4 ; mm5=CbE |
+ |
+ psllw mm7,BYTE_BIT |
+ por mm5,mm7 ; mm5=Cb |
+ movq MMWORD [ebx], mm5 ; Save Cb |
+ |
+ movq mm0, MMWORD [wk(3)] ; mm0=BO |
+ movq mm6, MMWORD [wk(2)] ; mm6=BE |
+ movq mm1, MMWORD [wk(1)] ; mm1=RO |
+ |
+ movq mm4,mm0 |
+ punpcklwd mm0,mm3 |
+ punpckhwd mm4,mm3 |
+ movq mm7,mm0 |
+ movq mm5,mm4 |
+ pmaddwd mm0,[GOTOFF(eax,PW_F0114_F0250)] ; mm0=BOL*FIX(0.114)+GOL*FIX(0.250) |
+ pmaddwd mm4,[GOTOFF(eax,PW_F0114_F0250)] ; mm4=BOH*FIX(0.114)+GOH*FIX(0.250) |
+ pmaddwd mm7,[GOTOFF(eax,PW_MF008_MF041)] ; mm7=BOL*-FIX(0.081)+GOL*-FIX(0.418) |
+ pmaddwd mm5,[GOTOFF(eax,PW_MF008_MF041)] ; mm5=BOH*-FIX(0.081)+GOH*-FIX(0.418) |
+ |
+ movq mm3,[GOTOFF(eax,PD_ONEHALF)] ; mm3=[PD_ONEHALF] |
+ |
+ paddd mm0, MMWORD [wk(4)] |
+ paddd mm4, MMWORD [wk(5)] |
+ paddd mm0,mm3 |
+ paddd mm4,mm3 |
+ psrld mm0,SCALEBITS ; mm0=YOL |
+ psrld mm4,SCALEBITS ; mm4=YOH |
+ packssdw mm0,mm4 ; mm0=YO |
+ |
+ pxor mm3,mm3 |
+ pxor mm4,mm4 |
+ punpcklwd mm3,mm1 ; mm3=ROL |
+ punpckhwd mm4,mm1 ; mm4=ROH |
+ psrld mm3,1 ; mm3=ROL*FIX(0.500) |
+ psrld mm4,1 ; mm4=ROH*FIX(0.500) |
+ |
+ movq mm1,[GOTOFF(eax,PD_ONEHALFM1_CJ)] ; mm1=[PD_ONEHALFM1_CJ] |
+ |
+ paddd mm7,mm3 |
+ paddd mm5,mm4 |
+ paddd mm7,mm1 |
+ paddd mm5,mm1 |
+ psrld mm7,SCALEBITS ; mm7=CrOL |
+ psrld mm5,SCALEBITS ; mm5=CrOH |
+ packssdw mm7,mm5 ; mm7=CrO |
+ |
+ movq mm3, MMWORD [wk(0)] ; mm3=RE |
+ |
+ movq mm4,mm6 |
+ punpcklwd mm6,mm2 |
+ punpckhwd mm4,mm2 |
+ movq mm1,mm6 |
+ movq mm5,mm4 |
+ pmaddwd mm6,[GOTOFF(eax,PW_F0114_F0250)] ; mm6=BEL*FIX(0.114)+GEL*FIX(0.250) |
+ pmaddwd mm4,[GOTOFF(eax,PW_F0114_F0250)] ; mm4=BEH*FIX(0.114)+GEH*FIX(0.250) |
+ pmaddwd mm1,[GOTOFF(eax,PW_MF008_MF041)] ; mm1=BEL*-FIX(0.081)+GEL*-FIX(0.418) |
+ pmaddwd mm5,[GOTOFF(eax,PW_MF008_MF041)] ; mm5=BEH*-FIX(0.081)+GEH*-FIX(0.418) |
+ |
+ movq mm2,[GOTOFF(eax,PD_ONEHALF)] ; mm2=[PD_ONEHALF] |
+ |
+ paddd mm6, MMWORD [wk(6)] |
+ paddd mm4, MMWORD [wk(7)] |
+ paddd mm6,mm2 |
+ paddd mm4,mm2 |
+ psrld mm6,SCALEBITS ; mm6=YEL |
+ psrld mm4,SCALEBITS ; mm4=YEH |
+ packssdw mm6,mm4 ; mm6=YE |
+ |
+ psllw mm0,BYTE_BIT |
+ por mm6,mm0 ; mm6=Y |
+ movq MMWORD [edi], mm6 ; Save Y |
+ |
+ pxor mm2,mm2 |
+ pxor mm4,mm4 |
+ punpcklwd mm2,mm3 ; mm2=REL |
+ punpckhwd mm4,mm3 ; mm4=REH |
+ psrld mm2,1 ; mm2=REL*FIX(0.500) |
+ psrld mm4,1 ; mm4=REH*FIX(0.500) |
+ |
+ movq mm0,[GOTOFF(eax,PD_ONEHALFM1_CJ)] ; mm0=[PD_ONEHALFM1_CJ] |
+ |
+ paddd mm1,mm2 |
+ paddd mm5,mm4 |
+ paddd mm1,mm0 |
+ paddd mm5,mm0 |
+ psrld mm1,SCALEBITS ; mm1=CrEL |
+ psrld mm5,SCALEBITS ; mm5=CrEH |
+ packssdw mm1,mm5 ; mm1=CrE |
+ |
+ psllw mm7,BYTE_BIT |
+ por mm1,mm7 ; mm1=Cr |
+ movq MMWORD [edx], mm1 ; Save Cr |
+ |
+ sub ecx, byte SIZEOF_MMWORD |
+ add esi, byte RGB_PIXELSIZE*SIZEOF_MMWORD ; inptr |
+ add edi, byte SIZEOF_MMWORD ; outptr0 |
+ add ebx, byte SIZEOF_MMWORD ; outptr1 |
+ add edx, byte SIZEOF_MMWORD ; outptr2 |
+ cmp ecx, byte SIZEOF_MMWORD |
+ jae near .columnloop |
+ test ecx,ecx |
+ jnz near .column_ld1 |
+ |
+ pop ecx ; col |
+ pop esi |
+ pop edi |
+ pop ebx |
+ pop edx |
+ poppic eax |
+ |
+ add esi, byte SIZEOF_JSAMPROW ; input_buf |
+ add edi, byte SIZEOF_JSAMPROW |
+ add ebx, byte SIZEOF_JSAMPROW |
+ add edx, byte SIZEOF_JSAMPROW |
+ dec eax ; num_rows |
+ jg near .rowloop |
+ |
+ emms ; empty MMX state |
+ |
+.return: |
+ pop edi |
+ pop esi |
+; pop edx ; need not be preserved |
+; pop ecx ; need not be preserved |
+ pop ebx |
+ mov esp,ebp ; esp <- aligned ebp |
+ pop esp ; esp <- original ebp |
+ pop ebp |
+ ret |
+ |
+; For some reason, the OS X linker does not honor the request to align the |
+; segment unless we do this. |
+ align 16 |